Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 620 0021 found under Retainer Packing by Summer Equipment Ltd. The National Stock Number assigned to this part is 5330219091377, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 620 0021.